高性能无铅铟基钙钛矿白光材料的设计合成及发光性能研究

近年来，全光谱金属卤素钙钛矿白光发光材料受到广泛关注，但面临铅的毒性及发光效率低等问题。在众多无铅材料中，铟（In3+）基钙钛矿具有环境友好、结构稳定、发光性能突出等特性，但其光谱中缺乏蓝光成分，不能实现白光。针对如何实现In3+基钙钛矿的高性能白光这一关键科学问题，本项目创造性地提出利用聚集诱导发光分子为有机阳离子来构建新型In3+基有机-无机杂化钙钛矿材料，以聚集诱导发光分子的高效率蓝光为互补光与卤化铟的红黄光结合实现白光；并利用具有5s2活性电子的掺杂离子Sb3+来进一步提升白光发光效率；系统研究含氮基聚集诱导发光分子结构和InSb双金属不同组分含量等与发光性能之间的内在关系，获得高白光量子效率（> 80%）的钙钛矿材料；通过多种先进表征手段揭示发光机理，研制高性能白光发光器件，为新型高效率白光材料的开发提供可靠的理论依据，同时为钙钛矿材料在高性能照明及显示领域的实际应用奠定基础。

For the past few years, full-spectrum metal-halide perovskites with white luminescence have received wide attention, which, however, are faced with problems such as lead toxicity and low photoluminescence (PL) efficiency. Among various lead-free materials, indium (In3+)-based perovskites have the merits of e environment-friendly, high structural stability, and outstanding PL performance, but their PL spectra lack blue light component, thus cannot achieve white emission. Aiming at the key scientific problem of how to achieve high-performance white luminescence in In3+-based perovskites, this project creatively uses aggregation-induced-emission molecules as organic cations to construct novel In3+-based organic-inorganic hybrid perovskites. White-light emission is achieved by combining the red-yellow light of indium halide cluster and the high efficiency blue light of aggregation-induced-emission molecules, which is used as a complementary light. Furthermore, Sb3+ dopant with 5s2 active electrons is used to improve the white PL efficiency. It is planned to systematically study the intrinsic relationship between structure of nitrogen-containing aggregation-induced-emission molecular, InSb content and PL performance, to realize perovskites with high white-light quantum efficiency (> 80%). A variety of advanced characterizations would be used to reveal the PL mechanism, and moreover, high-performance white light-emitting devices would also be constructed. This project provides a reliable theoretical basis for the development of new materials with high-performance white luminescence and also lays a foundation for the practical application of perovskites in high-performance lighting and display fields.